The server plugin still updates trakt.tv which in turn updates FB. The only feature missing by installing the client plugin is the ability to rate something after you watch it.

The client plugin will eventually make a return and hopefully receive a feature upgrade when it does. The quickest way to get it back would be to connect me with another .net programmer that's willing to help out. I'd be willing to work with someone, but can't afford to commit to the plugin full time. If you know any hobbyists or pro's that are interest try and recruit them.